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Patent US5068145A successfully refreshed from Google Patents.
US5068145A
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US
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Magnetic recording medium in which the magnetic layer contains a vinyl compound having an inner salt of an alkyl amino alkyl group
Assignee: Fujifilm Holdings Corp
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Filing: 1988-05-10
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Granted: 1991-11-26
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Expires: 2008-05-10
Abstract
Abstract A magnetic recording medium comprising a non-magnetic support having provided thereon a magnetic layer comprising a binder and ferromagnetic particles dispersed therein, wherein the magnetic layer further contains a vinyl compound having an inner salt of an alkylaminoalkyl group and the magnetic layer has been irradiated with radiation.
Inventors
- 👤 Hideomi Watanabe
- 👤 Tsutomu Okita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:29
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7023; G11B5/7026; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/31504; Y10T428/31551; Y10T428/31609
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
152 words
A magnetic recording medium comprising a non-magnetic support having provided thereon a magnetic layer comprising a binder and ferromagnetic particles dispersed therein, wherein said magnetic layer further contains a vinyl compound having an inner salt of a dialkylaminoalkyl group and said magnetic layer has been irradiated with radiation, and wherein said vinyl compound having an inner salt of a dialkylaminoalkyl group is represented by formula (I): ##STR12## wherein m represents an integer of from 1 to 4; R 1 and R 2 each represents an alkyl group having from 1 to 6 carbon atoms: R 3 represents an alkylene group having from 1 to 6 carbon atoms; R 4 represents a hydrogen atom, a methyl group, or an ethyl group; Y represents --COO.sup.⊖, OPO 3 .sup.⊖, --OPO 2 .sup.⊖, --OSO 3 .sup.⊖, or --OSO 2 .sup.⊖, --NO 3 .sup.⊖, or --NO 2 .sup.⊖ ; and X represents --COO--, --CONH--, --NHCOO--, or --NHCONH--.
Claim 2
Dependent Claim
152 words
A magnetic recording medium comprising a non-magnetic support having provided thereon a magnetic layer comprising a binder and ferromagnetic particles dispersed therein, wherein said magnetic layer further contains a vinyl compound having an inner salt of a dialkylaminoalkyl group and said magnetic layer has been irradiated with radiation, and wherein said vinyl compound having an inner salt of a dialkylaminoalkyl group is represented by formula (I): ##STR12## wherein m represents an integer of from 1 to 4; R 1 and R 2 each represents an alkyl group having from 1 to 6 carbon atoms: R 3 represents an alkylene group having from 1 to 6 carbon atoms; R 4 represents a hydrogen atom, a methyl group, or an ethyl group; Y represents --COO.sup.⊖, OPO 3 .sup.⊖, --OPO 2 .sup.⊖, --OSO 3 .sup.⊖, or --OSO 2 .sup.⊖, --NO 3 .sup.⊖, or --NO 2 .sup.⊖ ; and X represents --COO--, --CONH--, --NHCOO--, or --NHCONH--.
Claim 3
Dependent Claim
17 words
A magnetic recording medium as claimed in claim 1, wherein Y represents --COO.sup.⊖ or --OPO 3 .sup.⊖.
Claim 4
Dependent Claim
28 words
A magnetic recording medium as claimed in claim 1, wherein said vinyl compound having an inner salt of a dialkylaminoalkyl group is selected from the following compounds: ##STR13##
Claim 5
Dependent Claim
39 words
A magnetic recording medium as claimed in claim 1, wherein the amount of said vinyl compound having an inner salt of a dialkylaminoalkyl group is from 0.01 to 50 wt % based on the total amount of said binder.
Claim 6
Dependent Claim
39 words
A magnetic recording medium as claimed in claim 4, wherein the amount of said vinyl compound having an inner salt of a dialkylaminoalkyl group is from 0.02 to 30 wt % based on the total amount of said binder.
Claim 7
Dependent Claim
39 words
A magnetic recording medium as claimed in claim 5, wherein the amount of said vinyl compound having an inner salt of a dialkylaminoalkyl group is from 0.05 to 15 wt % based on the total amount of said binder.
Claim 8
Dependent Claim
26 words
A magnetic recording medium as claimed in claim 1, wherein the BET specific surface area of said ferromagnetic particles is 30 m 2 /g or more.
Claim 9
Dependent Claim
26 words
A magnetic recording medium as claimed in claim 7, wherein the BET specific surface area of said ferromagnetic particles is 45 m 2 /g or more.
Claim 10
Dependent Claim
17 words
A magnetic recording medium as claimed in claim 1, wherein said ferromagnetic particles are ferromagnetic alloy particles.
Claim 11
Dependent Claim
26 words
A magnetic recording medium as claimed in claim 1, wherein said binder is a vinyl chloride type resin, a urethane resin, or a radiation-hardenable-modified resin thereof.
Claim 12
Dependent Claim
40 words
A magnetic recording medium as claimed in claim 1, wherein said magnetic layer has been irradiated with an electron beam having an accelerating voltage of from 100 to 300 KV to an absorption dose of from 1 to 20 Mrad.
Claim 13
Dependent Claim
40 words
A magnetic recording medium as claimed in claim 11, wherein said magnetic layer has been irradiated with an electron beam having an accelerating voltage of from 150 to 250 KV to an absorption dose of from 3 to 15 Mrad.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |